Features:To magnetize or demagnetize the screwdriver tips and other components.It is suitable for 1.3mm to 10mm length metal parts.Internal with powerful C8 industrial Ceramic magnets.Producer durable and not easy to break with ABS plastic case.Easier to collect screwdrivers with the holes design on the magnetizer.Size 5mm to 11mm screwdriver blades are available.No electricity is required.